[SciPy-user] assign to diagonal values?

Alan G Isaac aisaac@american....
Sat May 23 16:26:57 CDT 2009


> On Sat, May 23, 2009 at 16:02, Alan G Isaac wrote:
>> On 1/31/2008 1:37 AM Anne Archibald apparently wrote:
>>> m[range(n),range(n)]=new_diagonal 
>> Will that work with range objects (in Python 3)? 

On 5/23/2009 5:05 PM Robert Kern apparently wrote:
> No. The automatic conversion to arrays does not consume iterators (nor 
> will it when we port to Python 3). 

Sure, but range objects are not iterators.
They are "almost" sequences.

     Python 3.0 (r30:67507, Dec  3 2008, 20:14:27) [MSC
     v.1500 32 bit (Intel)] on win32
     Type "help", "copyright", "credits" or "license" for more information.
     >>> r = range(10)
     >>> next(r)
     Traceback (most recent call last):
       File "<stdin>", line 1, in <module>
     TypeError: range object is not an iterator
     >>> 5 in r
     True
     >>> list(r)
     [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
     >>> list(r)
     [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Cheers,
Alan Isaac




More information about the SciPy-user mailing list